Gutters & Downspouts

Gutters and downspouts for distributing rainwater should be the correct size, durable, attractive and well-suited to buildings on which they are used. Because specifications depend on gutter type and special considerations, such as roof construction, you should consult with a company specializing in gutter design and installation for product advice.

Provide 1-square-inch of downspout area for every 100 square feet of roof area. A 2-inch-by-3-inch downspout will accommodate 600 to 700 square feet; a 3-inch-by-4-inch downspout will accommodate up to 1,200 square feet.

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Helpful Tool

Measure the Rain Runoff From Your Roof

Visit Save the Rain and learn how much water you can save by collecting what comes off your roof. Simply type in your address, mark the corners of your roof and the application will calculate your annual water savings based on the size and slope of your roof, as well as your local average rainfall.